The satellite remote sensing technology

the method of the surface run off collection of erosion plot and the evaluation method of agricultural eco-economy are used to investigate the soil erosion

the situation of land use

the storage volume of soil and water conservation woods

the coverage of forest and grass

the increasing output of grain

the storage volume of closure-preserved forest and young growth in restored Longchuan small watershed

Muding county

Yunnan province

which has been harnessed for 8 years. It indicates that after five-year harness and preservation

the soil erosion amount decreases from 594.00t of 1989 to 177.00 t of 1997

as occupies 29. 7% of the 1989s erosion amount. Among the types of land use

the square of dry land decreases 499.40hm2;the one of terrace increases 517hm2; the square of man-made woods increases 9484 hm2. The storage amount of soil and water conservation woods is 223460m3 per year and that of closure preserved forest and young grow this 53171 m3. The coverage of forest and grass goes up to 74.6% of 1997 from 38. 95% of 1989; the total amount of grain is 2.89× 107 kg

increased by 34.3%; the amount of agricultural productis 4935kg /hm2; the pure income of a farmer is 511 yuan.